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How to append a char to a std::string?
The following fails with the error prog.cpp:5:13: error: invalid conversion from ‘char’ to ‘const char*’
13 Answer...
Django datetime issues (default=datetime.now())
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it looks like datetime.now() is being evaluated when the model is defined, and not each time you add a record.
Django has a feature to accomplish what you are trying to do already:
date = models.DateTimeField(auto_now_add=T...
How to trigger a file download when clicking an HTML button or JavaScript
... but I don't know how to do this, and because of how common the words are, it's hard to find what I need on search engines. I'm thinking this should be an easy one to answer.
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Maximum length of the textual representation of an IPv6 address?
...:0000:0000:0000:0000:0000:0000:0000
8 * 4 + 7 = 39
8 groups of 4 digits with 7 : between them.
But if you have an IPv4-mapped IPv6 address, the last two groups can be written in base 10 separated by ., eg. [::ffff:192.168.100.228]. Written out fully:
0000:0000:0000:0000:0000:ffff:192.168.10...
What is a vertical tab?
...speed up printer vertical movement. Some printers used special tab belts with various tab spots. This helped align content on forms. VT to header space, fill in header, VT to body area, fill in lines, VT to form footer. Generally it was coded in the program as a character constant. From the keyb...
What is the difference between pull and clone in git?
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They're basically the same, except clone will setup additional remote tracking branches, not just master. Check out the man page:
Clones a repository into a newly created directory, creates remote-tracking branches for each branch in the cloned repository (visible using git b...
Preventing console window from closing on Visual Studio C/C++ Console application
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edited Jun 20 at 9:12
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answered Jan 8 '19 at 1:19
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How to convert a char to a String?
... the back door" by wrapping the char in a single-element array and passing it to the package private constructor String(char[], boolean), which avoids the array copy.
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Get list of a class' instance methods
...ant TestClass.instance_methods, unless you're interested in what TestClass itself can do.
class TestClass
def method1
end
def method2
end
def method3
end
end
TestClass.methods.grep(/method1/) # => []
TestClass.instance_methods.grep(/method1/) # => ["method1"]
TestClass.methods....
Inserting string at position x of another string
... need to insert string b into string a at the point represented by position . The result I'm looking for is "I want an apple". How can I do this with JavaScript?
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